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This study resolves ambiguity regarding lithium tetrafluoroborate (LiBF₄) high-temperature polymorphs using X-ray crystallography. A single-crystal-to-single-crystal phase transition was observed, confirming the existence of a new phase.

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Area of Science:

  • Solid-state chemistry
  • Crystallography
  • Materials science

Background:

  • Lithium tetrafluoroborate (LiBF₄) is a crucial component in electrolytes for lithium-ion batteries.
  • Previous research has been ambiguous regarding the existence of a high-temperature polymorph of LiBF₄.
  • Understanding phase transitions is vital for optimizing material performance and stability.

Purpose of the Study:

  • To definitively determine the single-crystal-to-single-crystal phase transition of LiBF₄.
  • To resolve longstanding ambiguities concerning the existence of a high-temperature polymorph of LiBF₄.
  • To characterize the structural changes associated with the phase transition using X-ray crystallography.

Main Methods:

  • Differential Scanning Calorimetry (DSC) to determine phase transition thermodynamics.
  • Single-crystal X-ray diffraction at low (200 K) and high (313 K) temperatures.
  • Analysis of crystallographic data to determine crystal systems and twin laws.

Main Results:

  • LiBF₄ exhibits an endothermic phase change at 28.2 °C with ΔH = 1180 J mol⁻¹ and ΔS = 3.92 J mol⁻¹K⁻¹.
  • The low-temperature phase (200 K) is a twinned trigonal P system.
  • The high-temperature phase (313 K) is a C-centered orthorhombic system, representing an interconversion of low-temperature twin geometries.

Conclusions:

  • The study confirms the existence of a high-temperature polymorph of LiBF₄ through single-crystal X-ray diffraction.
  • The observed structural changes are consistent with calorimetric and previous NMR findings.
  • This resolves ambiguity and provides critical structural insights into LiBF₄ phase transitions.